mcpbeat

Bellwether MCP Server

markets.bellwether/prediction-markets
answering

Bellwether is answering right now. Last checked 4 min ago. It exposes 3 tools.

Live Kalshi + Polymarket prediction-market data and cross-venue arbitrage spreads, one schema.

Uptime history 41 hours of history
41 hours agonow
100.0%
Uptime 24h
91 of 91 checks
3
Tools
read from the server
145 ms
Response time
average over 24h
open, no key
Access
streamable-http

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add prediction-markets --transport http https://api.bellwether.markets/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "prediction-markets": {
      "url": "https://api.bellwether.markets/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.prediction-markets]
url = "https://api.bellwether.markets/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "prediction-markets": {
      "url": "https://api.bellwether.markets/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "prediction-markets": {
      "url": "https://api.bellwether.markets/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

market
get_market
Get one normalized market. venue is 'kalshi' or 'polymarket'.
markets
list_markets
List open prediction markets across Kalshi and Polymarket (normalized).
matching
matching_markets
Find the same real-world event on both venues, with the YES price spread.

Endpoints

URLTransportStateLatencyChecked
https://api.bellwether.markets/mcp streamable-http answering 147 ms 4 min ago

Bellwether — questions

Answers built from our own checks of this server.

What can Bellwether do?
It exposes 3 tools, read directly from the server on our last check. Among them: get_market, list_markets, matching_markets. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Bellwether working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 145 ms. The bar chart above shows every period we have measured.
How do I connect Bellwether?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Bellwether need an API key?
No. Bellwether completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Bellwether?
It answers our handshake in 145 ms on average, which is faster than 75% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.